“I can assure everyone that by running, Roy Moore is going against my father and he’s doing a disservice to all conservatives across the country in the process,” the president's eldest son wrote in a Thursday afternoon tweet.

This is pure fake news. I can assure everyone that by running, Roy Moore is going against my father and he’s doing a disservice to all conservatives across the country in the process. https://t.co/pjfDKfoIO0